1,3,3,5,5-Hexamethyltrisiloxane

  • Trisiloxane, 1,1,3,3,5,5-hexamethyl-
Formula
C6H20O2Si3
Structure
Description
Liquid.

Registry Numbers and Inventories.
CAS
1189-93-1
EC (EINECS/ELINCS)
214-716-8
UN (DOT)
1993
Beilstein/Gmelin
1746341
Beilstein Reference
4-04-00-04115
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed

Properties.
Formula
C6H20O2Si3
Formula mass
208.48
Melting point, °C
-67
Boiling point, °C
128
Density
0.8246 g/cm3 (20 C)
Refractive index
1.385 (20 C)

Hazards and Protection.
Storage
Keep away from sources of ignition. Store in a cool, dry place. Store in a tightly closed container. Flammables-area.
Handling
Use spark-proof tools and explosion proof equipment. Avoid breathing dust, vapor, mist, or gas. Avoid contact with skin and eyes. Take precautionary measures against static discharges.
Protection
Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Remove all sources of ignition. Use a spark-proof tool.
Stability
Stable under normal shipping and handling conditions.
Incompatibilities
Oxidizing agents, strong acids.
Decomposition
Carbon monoxide, carbon dioxide, silicon oxide.

Fire.
Flash Point,°C
20
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Extinguishing media: Use foam, dry chemical, or carbon dioxide.

Health.
Exposure effects
   Ingestion
May cause irritation of the digestive tract. May be harmful if swallowed.
   Inhalation
Causes respiratory tract irritation. May be harmful if inhaled.
   Skin
Causes skin irritation. May be harmful if absorbed through the skin. Skin contact can cause brown stains in the area, and possible hardening of the outer skin layer.
   Eyes
Causes eye irritation.

First aid
 
   Ingestion
Get medical aid. Wash mouth out with water.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
1993
Response guide